<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadExcel"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="getExportExcel">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="btnUpload">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import FileSaver from 'file-saver'
import { downloadEmployeeTemplate, uploadEmployee } from '@/api/employee'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    // 下载模版
    async getExportExcel() {
      const res = await downloadEmployeeTemplate()
      FileSaver.saveAs(res, '员工模版.xlsx')
    },
    // 点击上传出发input框的click事件
    btnUpload() {
      // 弹出文件选择框
      this.$refs['excel-upload-input'].click()
    },
    // 选择文件后获取文件里面的值
    async uploadExcel(event) {
      // 1.获取上传文件的内容
      const files = event.target.files
      // 2.判断是否上传了文件
      if (files.length === 0) return
      // 3.生成接口所需要的数据格式 form-data
      // 文件上传 - 图片 / 音频 / excel / 视频.....需要使用form-data
      // 3.1生成一个formdata对象
      const fd = new FormData()
      // 3.2 将文件添加到formdata对象中
      fd.append('file', files[0])
      // 4.调用接口将文件上传给服务器
      try {
        await uploadEmployee(fd)
        console.log('选择文件内容', files)
        // 5.重新加载数据
        this.$emit('update')
        // 6.关闭弹层
        this.$emit('update:showExcelDialog', false)
        // 提示用户
        this.$message.success('上传成功')
      } finally {
        // 7.清空input的值
        this.$refs['excel-upload-input'].value = ''
      }
    }
  }
}
</script>

  <style scoped lang="scss">
      .upload-excel {
        display: flex;
        justify-content: center;
        margin: 20px;
        width: 360px;
        height: 180px;
        align-items: center;
        color: #697086;
        .excel-upload-input {
          display: none;
          z-index: -9999;
        }
        .btn-upload,
        .drop {
          border: 1px dashed #dcdfe6;
          width: 100%;
          height: 100%;
          text-align: center;
          line-height: 160px;
          border-radius: 8px;
          display: flex;
          flex-direction: column;
          justify-content: center;
        }
        .drop {
          line-height: 40px;
          color: #bbb;
          i {
            font-size: 60px;
            display: block;
            color: #c0c4cc;
          }
        }
      }
  </style>
